It was completely removed.

Yikes, without a word either? I feel like if an editor utilizing 3D features decides to upgrade (for $150, mind you) and then finds out that it's vanished without any communication... then that is a major issue. Never used the feature myself, but I recall it being a selling point at one time and am really hoping the VEGAS team addresses this out of good faith.

I upgraded from 21 to 23 and it seems like they moved the Stereoscopic 3D Mode option? Please don't tell me they've removed it completely?

It was completely removed.

Why though? There was literally no reason for them to remove it

Stereoscopic 3D has largely fallen out of use.

Stereoscopic 3D has largely fallen out of use.

Many of VEGAS Pro's direct competitors in the NLE market still continue to support this feature. Not to mention, why was there no documentation of this major feature removal for the users that rely on it?

.Why though? There was literally no reason for them to remove it

We had a very good reason to remove it...

The Stereoscopic 3D feature was one of the huge bottlenecks in the original video engine and it was not compatible with GPU features. It was decided to not add the complicated 3D pipeline into the new engine for stability and performance reasons. Also the number of users depending on 3D was very small and has been shrinking for several years, thus not justifying significant resources needed to implement 3D in a way that would not significantly reduce the editing experience for most Vegas users.